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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc783f3375f70958896486b46660c85e31a8fa18847b9a80f83c386dfdbde4f' 
  AND token = 'm8APUXh/aE8Do5qJLQceGNBqDMCkY3zBtE0eJ1xcbr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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