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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa961c97163fd781be9e81dd35a390706515ce4117829f994b60113ed615887e' 
  AND token = 'TZyU/71wahN306+yJZc6u3P/77K+y/7Z4IKXVw5vhP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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