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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4802a783c68d8d371ce3c187ae314c54cfc4b0d0af7a8a36fbcec7525df23f' 
  AND token = '7OWrmIw/T0VXwrER4wPIMXVJc3bckw4wpgk0MgRYgUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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