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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfd01c5bae52207e1ed7aabb7db4f7435e125d2b251b7b004314c07f2fb7a36' 
  AND token = 'px47EPQ4PHVtyoNSBkA2EzlO0I0PJM2bMxybaM0t9QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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