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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddda4358ad184317d9cc95f00bf889f441466247dcb8ee29db92ca850a0159f' 
  AND token = '6tkBpjHEFaD6K8j89SCk6wuCbNBwT+I27IgvbwP1nzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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