SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05521019b6e6e9e8482abf5930260261bf6a73262d2913bbe78ef4781ca38407' 
  AND token = 'D4mfL+kGZkmfLJDK4GWDiPOxdyT4a+Vp/jcU3qC0jQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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