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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c609ec87fa90f3439d9d188fc7b81aaa7158443fb4d89cc36937f3f9682a1b' 
  AND token = 'UUQ609HuE/1xzjcET2GppqTc7TvreXbfmoJY9K9kM8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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