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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ad53b2c0cfbfc55fd453689aed6ea8d98fad93cd9b5e3d8b650f390c4d5117' 
  AND token = 'YRPdXNgq8ANCzyx2qEF/IkDJR0MCkuv7FJj/yeCeRBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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