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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e54676f92ecbd64e9520856dcb28e24e2014cca6d4aeb789629ce5bc8081497' 
  AND token = 'Qu/xT0M+vrzrt9OzNq3tApruas2FmA0pvtcX7gq7FXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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