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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103ab4aa9eebcce5092f0faf56cb659b711cbf13561e87555d61ca8ad9de8d55' 
  AND token = '/zEIJI3fYr7TfTnXAB4H0LVOnqNnlAr7JRu4dn5ga6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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