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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13f787cbe34ee980598d52d18334e8b27ff5fec03a9ef14979dfb3e298b2edd' 
  AND token = 'erjwmpEKSZGtQ6owbww6jbVdIMnuzi6+6fCkFe3ONQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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