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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f644557091dbea5e36a0085e1cad60f92fca101c8e4133590b565bf92d69018' 
  AND token = 'snqs9iF192Kza1d8lIJEDUAh275RRvRoCCPfNQEo5vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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