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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eef8925dd07c42008ec7054a93d15a58156036cf173140708ace3b85673d805' 
  AND token = 'qU1HfrPcDtbtm7/1FRT6Lgmf7ys4mDwdaHHCpbNoXq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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