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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a76a02ea862d09d4c7553046f498b250af665074c0c608e32f26a9de64d5b6' 
  AND token = 'iNAvhvsG0RJAjSSP00Q8Yzj97F/qAHPaE8TMHZzrpks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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