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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423f324badac09291f209c50ada74e398226fd9e2f3dd3332a19bf7713cab42f' 
  AND token = 'zGy7XIaTOd7yDj8QyVzdIjXrBu4oU6iR0qiAe4Zk0Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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