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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659d0aa81c1fc1004ed5414960414f3738ff1e5cd860460b81cd6e7741f184ad' 
  AND token = 'sAxjJpysdP0EU3t7rumNanJ6fEoaETAHDizqm3575G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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