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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dd21e8f26807a80c05348cef7d2ad8fde19da92f5cdd2c4f48f789869e2ce0' 
  AND token = 'cRmNG3IqldzqS31iysdIQl/iysfUQkUr2rEexUU/lT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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