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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ff0a89cae262e74d25e4e49aef6726ed0bc355a8581a07aa8d420cf1c581e7' 
  AND token = 'r50tuqb62Bknbiz4JNoDvAlwTVKLHFzJNSJNCFAeGI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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