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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde9663054c9d8a01b441fcb3c301ab70d59741a28f1182dcb2f487376c0f524' 
  AND token = '0RIL6A3DVmYw3Co1ql6grdnDdmGfe0XSnxU2Mg49vPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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