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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02bb0b63211c981bfcbc5d775d9d47b525a01f055c034a3ba3a0310ea81e21c' 
  AND token = 'MFU41ipefsyBiUUTXmqx+5lpiHQhLN+x37wjI+mdNps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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