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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f737af9625bdab770c0b8cf1f7692a56631eb23549aca1eb28e135374f07ad3' 
  AND token = 'WbD7SDmceNiJbRUREndVWU23WbM1xOxyNmc4HNUzKH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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