SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c249af5502b0d625c6bfd2b6829f30c7fa89c9d264ea6ae66c37f979c191d7' 
  AND token = 'B1JNK5/j+G/MYkLVL/TClMyrXwsnxoCDoNBGvK7dHME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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