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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3b8ea51a2836770ef2ea2b8811f89ca4f22ea69e3c0d5c85773a566dbf3fd7' 
  AND token = 'xQTRXETP7cyDJdNhn2VNoiH/Z4+qoAEIqiYRLetMEd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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