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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab923e518f356a679f9b1cef2853039859a9ee8433180ae51075854858b17cf2' 
  AND token = 'lrnlRgWBUPFZUxi2aMssMh1FO353SJe/ND3zRM8wjb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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