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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca5de52b2ff0e2c892e8cfc48d68df8a7ddaff566b6f3793bd9117ae3fc71d3' 
  AND token = 'Mj8a+xW8Xw2z6oOHZxr/M5FHjhe+2C/9tVNR30KWjZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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