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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7724bb7c3dd704672776fd60a755fde5123700b8a1119ffe0e2d1ce46db50166' 
  AND token = 'yJYlG2XgCDJSddOUCHX7LXBV9BWpO427rhnFmiWCzqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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