SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c32cafe28d8ab5b385d425f781a50f46051a1e1346044bc92827423eb863717' 
  AND token = 'XHpmRRFBfXg+rXcpaFjbY/yjUEjPCQUrUg4o+4zoK6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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