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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe2cd831aa40d4af9ee54b5abaf9425e4ffc08e400cbc17ac971ba167688a80' 
  AND token = 'oIMUxrt2Yq+Y8oY/4ZYVaCYyE3bBO8GevcQLMdjOq4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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