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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cde7e689d240eb49989527606d7776b719dec2df6a30b896802d3dfd61c211' 
  AND token = 'g5Myxq3me4mlKX1tzw9Y/sOVF92HtJsglxEIcWYFbEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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