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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926314db8c7b7f9ecc6fd5064f8af34a39e164050d75434c42f00cf7d5eed403' 
  AND token = 'gW3UFNw36ljd88Upl5/ffkL75ZQ2QpDIrxIXEGFkJB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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