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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973cf36aacb96e4da7ffd5677aa10baf7984cdaa261375194bf8d08be847d8d3' 
  AND token = 'n+urFcX03Ths16GIZr8F9FKUB/BmIL73bjM81qyjiUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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