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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04809bbc9d958313a2677b6ab39e30ec2c23247bf7cb546d76d28e6d4ca1fb0' 
  AND token = 'ACJQQibgcqw4GzzZinL6ztyWe9WHsoyyQrL2+Ky/+sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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