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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cb4b3d71ea7f594bf7b5f513df3565dc3057063f16c5ed925254cf80eecf57' 
  AND token = 'vSyRCfmpJwPETYAZ4v+XEQ3sID0HdF6GUi443BP/ANs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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