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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e605bb4f943ae665777dba9f94955c96bbd6f7b13a9bc93f15ecca5cf7ad50' 
  AND token = 'cCAMd7gihsaueggq6zByg3xXnB2MAq0HdVRi3jTk2+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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