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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904d5902e9f8ad412db6fa83def7ce155fe4fee289d9b97898aab99ba47e1841' 
  AND token = '3oev5101GJrv2iW/8NUNDb+FX2qJgUQ5cK6Vww/5Ugk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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