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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b584e2f8d13deaddf8fbe58a98ed2e623104c8cd7764ff1b52412e8778a6f1' 
  AND token = '2wGGdklVGzewABDM/Uuc//sX7F9Y6oU8mIDoXCcgGio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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