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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf43722ace66e6c017740eb49a0be4d520cc6f8732890e49afa6132d6b672364' 
  AND token = 'aKzO7fgevsmqatr1IfqpnENfj90K+21p4JqPErFdIVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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