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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd91ae0622786cbb8930ef6b86ada3bae27eea9e1140c05b5800554674cb9ea' 
  AND token = '4AY6EDkx8xqYXQcRFv/wbRk5ii7K4AjnD0i7mD85PPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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