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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adab93a72ebd04c771be1978b54d8c278c7df511cb123d5e31fcb92dd7bc7fd' 
  AND token = 'PG9B930mMbMcLkrKgua9kBZeG7T1lTATdLTetwRglig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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