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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf28ea2e45cb06b79f435e30b375210dcbc5a712449f85d6405a9f3e68672a5' 
  AND token = 'bC5+T2nEx0mBhg6YHaBmKRkfjhPeTwtkhNJcAnyU7As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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