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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee957aad04126400431343a5e615169a71e8d3803052dc0ddaf953536ac29c4' 
  AND token = 'CNSq+Lhf8HFCJDRWJ5N9DOtAkfe2DnFo/Kr0XEnCYLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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