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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae1776d5f4f8e800ee9e51a5f6d2cab883c405b777188f7ab3a845476ed7721' 
  AND token = 'DGxEnjF7FISAP8m9o29BWaQG2uFFDn5Z36GE6zrddG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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