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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81622927ec740855f82441b742784bc77460ba1a308fa3afd3d6d80272267c93' 
  AND token = 'csBLF9AQDTw5YwtRAAJ25f7ZthcyZBcmB0RWT6rMDBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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