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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3492f2c7d16168c04e056a60c6cca53d73ea17cc9eec4e882b4b025c6719dd7' 
  AND token = 'RQWihJ58kkPii1fq/6WtKLDFGsEoNCGg0I/H6Dv7Du4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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