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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd340165725feb52df07a475026d21f1d4b139c69813db111dc07999435f55e42' 
  AND token = 'kqnF55UUsjh2fJ1gYg19k9J1/9BUQAhySUPNSIgdxJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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