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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a5b7deb749825324b97a0483815dcd06b700f5ab3bf4a290fdcc8182a28dd7' 
  AND token = '+ljy0ljHKXmv42Q+YrcfxNIwncO3XmuvR55A+lPvOtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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