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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88de02562fd0ed8a061aca80b79b0ff9d1b5631d8dd09b31a38f6a4480326f0e' 
  AND token = 'bC8GKT6H0RQo1dVFh2q7dqTrY3wRD1WVyKNJ5Eocsa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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