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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e14b123850371826e6bae90302836cf53d1cd5c37bb07715b67257792f195b' 
  AND token = 'OQFw/tznp6TlpYgn6ToE8yQFY3ncZ8gLIdK1zG4UIWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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