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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2238a7382238162cf0a8d2f8b6ccdf6411e14cb84a5c5860cefe2245cc4d4770' 
  AND token = 'rfCb3cNQeEaI2v7+syu43Li4h/DQgbEL9bIdrrTzwuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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