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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e5b9d21f460dc1acab7c01272ca5e43e4b43bf0bea3132a6f92e807156cc65' 
  AND token = '3uQaYFSVlA39T+bqWINli98H6OVOzaRsgrh+0bBIEc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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