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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd1efd5eeb749a8794be266229fe01f9aaa7aa21f172246783e542edc73bded' 
  AND token = 'XBMsqHPWV5OFhWs4m2rKovlXV0GZNZ1ZdJek7kQOLuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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