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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d67de7920db08a565b9b8ee700106412c791f986a00f00e4dea3d8a859b11f' 
  AND token = 'mNna99I/yYK483izVu2nbQTb9xZlOzn9Un4jQGzSPdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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