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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f24b152f8c6699021d3e86b1f246d53c4b46f1630181efd0eab62a22988f59f' 
  AND token = 'XM9br3bTOMN2qwjUxs7oKY7ZiBOGQRLlmuZP1cB9wNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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