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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68b44d66cba5117b57586618f6051a205d5cd87f91865021dc49a048c73c219' 
  AND token = 'w7MpM5FqTId7K9DcWubYCssvNLIUeo3edElAFfi+Pl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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