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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6498efe2df12450271df9d480646db15cc0c02e235d26736e36066f02950ba6c' 
  AND token = 'YtrqK/+g7vrY0t4e2hMyR20f4Aurxioxm1RZ9Spe6xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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