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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df041bebd51714d79c12a3fa7962151d9cdb7f62eb00f27d82cbd11dca99679' 
  AND token = 'm9Q2wu8sc8/IOb2BICX8YBAL3Xi2PDJ+rdc9icd6uQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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