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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1ea2d487b109f71bb12104787d4ce5f5f68271bb780b89ad3c74feb4b7b181' 
  AND token = '3okehtSKKRGkXkziTGXmwXQBaq+K+5OATUZFtV6l4jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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