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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89f9823470f92e06888d6b63cb6c423e3ea8e991fe3d89f6a99bf0228ace325' 
  AND token = '26aFOrLyGmq+H8P84ndmrS7FJkZo586uE4Xz5u59yrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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