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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e599035d6fd5e220bf1ad333618a3eaa14fe523a061abec5173d9378c0506a4e' 
  AND token = 'MRhnTDlvQHif8zjv32z+YzK5ki2EJK0cq+0Li1wYUnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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