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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ca0a4f39c76e78a1dde23cae80e2de12a6242f75ab6148a4f08ccf380faad9' 
  AND token = 'L8XftxuLmFCLOEMD9o+4eDtIWXwwrk4p2c4lnLwIsf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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