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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a967c4d9783cf936d2a96ea423c5b58d31405518f8d171c435db068aae992503' 
  AND token = 'XHRCi9EliFojOc6h73ScNwh41gO5kbEyAM3Sii+08ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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