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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6975504de6d6c8caf5f03906ff18a1248ea967fe92518dc84b1652de6d752699' 
  AND token = 'CvEDkjiNSgCilNYHD9UzQ+rqwMa6ARypMnlVr8U012E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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