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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5f02d87a306810eea5dcdb5f138bc89a3050357f3a15264cc6395d4aafb7a4' 
  AND token = 'ria9n7Q7az2upeYWB7DmgHewiR5wqpz7O93jG8oouiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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