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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f492876e45f7f45e33e1aebd1148437ad59071aa88bd1ea54243c16b4f0ef65' 
  AND token = 'QEgaHbGtHxf67r+lyu8gEzLOxQSMLokI+e6CsTXMiBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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