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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c7f96c6e738d0972c577900607189b022c6a7b511f550435f8c5dea622959b' 
  AND token = 'xW7rE5fe7oVT/h1gLHd7DB4uk5PuaHhX6fkfTxd9iHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}