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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad522d5c07c2e6837d85cf3658541276bec30bfe5f710eb49acf3a246ffeda9' 
  AND token = 'Av9Pq4lrXDt4K5WmyWtOapxWpwFGdhFmY3am25TDE+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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