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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8aa92f8fd5cc7a0551e964b3af8ab83cda05d9cd820b8da6a39ae9eb621f3e1' 
  AND token = 'yPzQcFhHPK2rYVxmgTKRPoLxONQvEn4nylnbWRM3eUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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