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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec52d6530d6ee3368d7a2c6fadcf20c4b53984df665c9d15da5f57613fe518d9' 
  AND token = 'RpeWX8zDS2PO71UPtYkdFkhOJObWDy/MWMyAuZ0Zm3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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