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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0899ea920f3a85438d79eade68a61d143809afc466e4c84af8e5c1fc3d2e815a' 
  AND token = 'q3mbHxzk/WIyuL6WuNuYSyqa9ZQFEuQD+l+q4YpuKRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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