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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b633c6273d8ec76c797e701138dc4a505e362264f37e6d650088f8df6f8483b0' 
  AND token = 'nzxUWIvm6J1yW3o91/E8AdWHSOD9YuB7s96IPRNdp48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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